<template>
	<view>
		<!--使用自定义的搜索组件-->
		<my-search @click="gotoSearch"></my-search>
		
		<view class="scroll-view-container">
			<!--左侧滑动区域-->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
				<block v-for="(item,i) in cateList" :key="i">
					<view class="left-scroll-view-item" :class="{ active: i === active}" @click="selectCategory(i)">{{item.name}}</view>
				</block>
			</scroll-view>
			<!--右侧滑动区域-->
			<scroll-view class="right-scroll-view" scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<!--二级分类的标题-->
					<view class="cate-lv2-title">/{{item2.name}}/</view>
					<!--当前二级分类下的三级分类列表-->
					<view class="cate-lv3-list">
						<!--三级分类的item项-->
						<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
							<!--三级分类的图片-->
							<image :src="item3.icon"></image>
							<!--三级分类的文本-->
							<text>{{item3.name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
			
		</view>
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badage.js' 
	export default {
		mixins:[badgeMix],
		data() {
			return {
				//当前设备可用的高度
				wh: 0,
				cateList:[],
				active: 0,
				//二级分类的列表
				cateLevel2:[],
				scrollTop: 0
			};
		},
		onLoad(){
			const sysInfo = uni.getSystemInfoSync()
			this.wh = sysInfo.windowHeight - 50
			this.getCateList()
		},
		methods:{
			async getCateList(){
				const res = await uni.$http.get('/api/cate')
				if(res.statusCode !== 200)return uni.$showMsg()
				this.cateList = res.data.data.map(firstLevel=>({
					id:firstLevel.id,
					name:firstLevel.name,
					children:(firstLevel.children || []).map(secondLevel=>({
						id:secondLevel.id,
						name:secondLevel.name,
						children:(secondLevel.children || []).map(thirdLevel =>({
							id:thirdLevel.id,
							name:thirdLevel.name,
							icon:thirdLevel.icon
						}))
					}))
				}))
				
				//为二级分类赋值
				this.cateLevel2 = this.cateList[0]?.children || [] //初始化第一个分类的二级数据
				console.log('一级分类数据:', JSON.stringify(this.cateList))
				uni.$showMsg('数据请求成功！')
			},
			selectCategory(i){
				this.active = i
			
			//重新为二级分类赋值
			this.cateLevel2 = this.cateList[i]?.children || []
			this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			gotoGoodsList(item3){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid=' + item3.id
				})
			},
			gotoSearch(){
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
	.scroll-view-container{
		display: flex;
	}
	
	.left-scroll-view{
		width: 120px;
	}
	
	.right-scroll-view{
		flex:1
		
	}
	
	.left-scroll-view-item{
		background-color: #F7F7F7;
		line-height: 60px;
		text-align: center;
		font-size: 12px;
		position: relative;
		
		&.active {
			background-color: #FFFFFF;
			
			&::before {
				content: '';
				display: block;
				width: 3px;
				height: 30px;
				background-color: #C00000;
				position: absolute;
				top: 50%;
				left: 0;
				transform: translateY(-50%);
			}
		}
	}
	
	.cate-lv2-title{
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
	}
	
	.cate-lv3-list{
		display: flex;
		flex-wrap: wrap;
		padding: 10px;
		.cate-lv3-item{
			width: 33.33%;
			display: flex;
			flex-direction: column;
			justify-content: center;
			align-items: center;
			margin-bottom: 10px;
			image{
				width: 60px;
				height:60px
			}
			text{
				font-size: 12px;
			}
		}
	}
</style>
